You can play thousands of songs with those chords.

Ziggy stardust (D Bowie)

G D C Em

Knockin on Heaven's door

G D C (Chorus) G D Am (Verse)

No Woman No Cry

C G Am F C G C G

It is almost impossible to list them all!!!

Would be handy to learn B and Bm as well though, you would unlock the remaining 25% of popular music songs.